<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .left {
            float: left;
            width: 100px;
            height: 100px;
            border: 1px solid #000;
        }
        .content {
            height: 100px;
            overflow: hidden;
            background: blue;
        }
    </style>
</head>
<body>
    <div class="left">123</div>
    <div class="left">123</div>
    <div class="left">123</div>
    <div class="content"></div>
</body>
</html>